Background: To explore the diagnostic significance of pre-surgery peripheral blood tumor markers cancer antigen 125 (CA125) and human epitope protein 4 (HE4), in conjunction with neutrophil-to-lymphocyte ratio (NLR), monocyte-to-lymphocyte ratio (MLR), platelet count-to-lymphocyte ratio (PLR), and systemic immunoinflammatory index (SII), in the differential diagnosis of epithelial ovarian cancer (EOC) and benign ovarian tumors. Here, MUC16 is linked to neoplasm.